51 single chip microcomputer + 8*8 dot matrix to achieve the greedy snake source code-EEWORLD

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Circuit diagram and MCU simulation file download: http://www.51hei.com/bbs/dpj-20604-1.html

Below is the source code:
#include
#define uchar unsigned char
#define SNAKE 20 //maximum length
#define TIME 50 //display delay time
#define SPEED 71 //speed control
//#define keyenable 1
sbit keyenable=P3^6; //direction enable
/*sbit keyx=P0^1; //left and right
sbit keyy=P0^2; //up and down */
//sbit up=P0^0;
sbit up=P3^3; //down
sbit down=P3^1;
sbit right=P3^2;
sbit left=P3^4;
uchar x[SNAKE+1];
uchar y[SNAKE+1];
uchar time,n,i,e; //Delay time, current snake length, general loop variable, current speed
char addx, addy; //Displacement offset
/********************
Delay program
************************/
void delay(char MS)
{
char us, usn;
while(MS!=0)
{
usn = 0;
while(usn!=0)
{
us=0xff;
while (us!=0){us--;}; usn--;
}
MS--
;
}
}
/*******************************************
Judge collision
*******************************************/
bit knock()
{bit k;
k=0;
if(x[1]>7||y[1]>7)k=1; //Hit the wallfor
(i=2;i k;
}
/*********************
Up, down, left, and right key position processing
********************/
void turnkey()// interrupt 0 using 2
{//up=1;
if(keyenable)
{
if(left){addy=0;if(addx!=1)addx=-1; else addx=1;}
if(right){addy=0;if(addx!=-1)addx=1; else addx=-1;}
if(up){addx=0;if(addy!=-1)addy=1; else addy=-1;} if(down){ addx=0;
if(addy!=1)addy=-1; else addy=1;}
/*if(keyy)
{addy=0; //left and right
if(keyx)if(addx==-1)addx=-1; else addx=1; //left
else
if(addx==1)addx=1; else addx=-1; //right
}
else
{addx=0; //upper and lower
if(keyx)if(addy==1)addy=1; else addy=-1; //lower
else
if(addy==-1)addy=-1; else addy=1; //upper
} */
}
}[page]
/*******************
exponentiation program
****************/
uchar mux(uchar temp)
{
if(temp==7)return 128;
if(temp==6)return 64;
if(temp==5)return 32; ==
4)return 16;
if(temp==3)return 8;
if(temp==2)return 4;
if(temp==1)return 2;
if(temp==0)return 1;
return 0;
}
/*****************
Show clock display program
********************/
void timer0(uchar k)
{while(k--)
{for(i=0;i {P2=mux(x[i]);P1=255-mux(y[i]);
turnkey(); //Up, down, left and right key processing
delay(TIME); //Display delay
P2=0x00;P1=0xff;
}}
}
/********************* Main
program
********************/
void main(void)
{e=SPEED;
P0=0x00;
P1=0xff;
P2=0x00;
P3=0x00;
while(1)
{//if(keyenable==1){P1=0x00;P2=0xff;}else{P1=0xff;P2=0x00;}
for(i=3;i [0]=4;y[0]=4; //fruitn
=3; //snake lengthn=-1
x[1]=1;y[1]=0; //snake headx
[2]=0;y[2]=0; //snake tail1
addx=0;addy=0; //displacement offset
//k=1;
while(1){if(keyenable)break;timer0(1);}
while(1)
{timer0(e);
   if(knock()){e=SPEED;break;} //Judge collisionif
        ((x[0]==x[1]+addx)&(y[0]==y[1]+addy)) //Eat or not
           {n++;
     if(n==SNAKE+1)
     {n=3;e=e-10;
     for(i=3;i            for(i=3;i      }
           x[0]=x[n-2];
           y[0]=y[n-2];
           }
    for(i=n-1;i>1;i--){x[i]=x[i-1];y[i ]=y[i-1];}
    //x[n-1]=x[2];y[n-1]=y[2];
    x[1]=x[2]+addx;y[1]=y[2]+addy; //Move
}
}
}

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